Shimizu, T. and Takahashi, W. (1996) “Fixed points of multivalued mappings in certain convex metric spaces”, Topological Methods in Nonlinear Analysis, 8(1), pp. 197–203. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.028 (Accessed: 7 July 2025).